Efficient solar-driven CO 2 -to-fuel conversion via Ni/MgAlO x @SiO 2 nanocomposites at low temperature

• Published in: Fundamental research (Beijing) 2024-01, Vol.4 (1), p.131
• Main Authors: Liu, Xianglei, Ling, Yueyue, Sun, Chen, Shi, Hang, Zheng, Hangbin, Song, Chao, Gao, Ke, Dang, Chunzhuo, Sun, Nan, Xuan, Yimin, Ding, Yulong
• Format: Article
• Language: English
• ISSN: 2667-3258
• DOI: 10.1016/j.fmre.2022.04.011

Solar-driven CO -to-fuel conversion assisted by another major greenhouse gas CH is promising to concurrently tackle energy shortage and global warming problems. However, current techniques still suffer from drawbacks of low efficiency, poor stability, and low selectivity. Here, a novel nanocomposite composed of interconnected Ni/MgAlO nanoflakes grown on SiO particles with excellent spatial confinement of active sites is proposed for direct solar-driven CO -to-fuel conversion. An ultrahigh light-to-fuel efficiency up to 35.7%, high production rates of H (136.6 mmol min g ) and CO (148.2 mmol min g ), excellent selectivity (H /CO ratio of 0.92), and good stability are reported simultaneously. These outstanding performances are attributed to strong metal-support interactions, improved CO absorption and activation, and decreased apparent activation energy under direct light illumination. MgAlO @SiO support helps to lower the activation energy of CH* oxidation to CHO* and improve the dissociation of CH to CH * as confirmed by DFT calculations. Moreover, the lattice oxygen of MgAlO participates in the reaction and contributes to the removal of carbon deposition. This work provides promising routes for the conversion of greenhouse gasses into industrially valuable syngas with high efficiency, high selectivity, and benign sustainability.